[gradsusr] concatenating files

[Frank Colby]

Jennifer,

Thanks for the help  I didn't realize how much more meta data was 
included in the grib2 files.
I had found something online that seemed to suggest grib1 files worked 
the same way as grib2.
Now it makes sense that it didn't work out.

Frank

On 7/8/2016 9:18 AM, Jennifer M Adams wrote:
> Hi, Frank —
> You can’t concatenate grib1 ensemble files and expect gribmap to 
> distinguish between them — there isn’t any ensemble metadata in a 
> grib1 header. This is discussed in the documentation for ensembles 
> under ‘how to organize your data’: 
> http://cola.gmu.edu/grads/gadoc/ensembles.html#data 
> <https://urldefense.proofpoint.com/v2/url?u=http-3A__cola.gmu.edu_grads_gadoc_ensembles.html-23data&d=CwMF-g&c=lqHimbpwJeF7VTDNof4ddl8H-RbXeAdbMI2MFE1TXqA&r=6tSfNfW9eok2dvPp1qvMgNtd3pXLhNg0FMEbTXyDrbI&m=QPqA9k9AYEgTmQJHxaUoZ_ddngbq5ay2qvumidlIA3A&s=rfyXUHXXIldohh5hjQltp04HTFH4kkXgAH3khibQUIk&e=>. 
> For GFS ensembles, I use a descriptor file like this:
>
> dset ^gfsens.%e.%iy4%im2%id2%ih2.fh%f3.grib2
> dtype grib2
> title NCEP 5D Ensemble Forecast Initialized 00z08jul2016 6-hourly out 
> to 192 hours
> index ^gfsens.2016070800.map
> options template pascals
> undef -9.99e33
> xdef 360 linear  0.0 1.0
> ydef 181 linear -90.0 1.0
> zdef  10 levels 100000 92500 85000 70000 50000 25000 20000 10000 5000 1000
> tdef  33 linear 00z08jul2016 6hr
> edef 22
> *name length initialtime <type,pert or deriv>
> avg  33  00z08jul2016   0
> c00  33  00z08jul2016  1,0
> p01  33  00z08jul2016  3,1
> p02  33  00z08jul2016  3,2
> p03  33  00z08jul2016  3,3
> p04  33  00z08jul2016  3,4
> p05  33  00z08jul2016  3,5
> p06  33  00z08jul2016  3,6
> p07  33  00z08jul2016  3,7
> p08  33  00z08jul2016  3,8
> p09  33  00z08jul2016  3,9
> p10  33  00z08jul2016  3,10
> p11  33  00z08jul2016  3,11
> p12  33  00z08jul2016  3,12
> p13  33  00z08jul2016  3,13
> p14  33  00z08jul2016  3,14
> p15  33  00z08jul2016  3,15
> p16  33  00z08jul2016  3,16
> p17  33  00z08jul2016  3,17
> p18  33  00z08jul2016  3,18
> p19  33  00z08jul2016  3,19
> p20  33  00z08jul2016  3,20
> endedef
> vars
> ....
> endvars
>
>
> On Jul 7, 2016, at 5:21 PM, Frank Colby <Frank_Colby at uml.edu 
> <mailto:Frank_Colby at uml.edu>> wrote:
>
>> Hi GradsUsers,
>>
>> Does anyone have an easy way to handle GFS Ensemble files?  I have
>> output from ensemble runs that have separate files for each ensemble
>> member at each forecast hour.  I would like to put the ensemble members
>> together into a single file.  I used cat to put two files together as a
>> test, and wgrib (these are grib1 files) shows that both ensemble members
>> are indeed there.  However, when I use grib2ctl and gribmap to make the
>> ctl and index files, and open the file, it only has the first ensemble
>> member.   It's as if grib2ctl never read that there was a second
>> ensemble member.
>>
>> What am I missing here?
>>
>> Thanks,
>> Frank Colby
>> UMass Lowell
>>
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>
> --
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> George Mason University
>
>
>
>
>
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